Magnetization of the canted antiferromagnetic CoCO 3 in Abragam–Pryce approximation

Abstract

Weiss molecular field theory was used to calculate the magnetization of the canted antiferromagnetic CoCO 3 ( T N = 1 8.1 K ). Wave functions of magnetic doublets near Co 2+ ground state in Abragam–Pryce approximation were determined. One of the crystal field variables, free Co 2+ ion isotropic exchange interaction inside, and between magnetic sublatticies, and rotation angle ϕ , characterizing nonequivalence ion Co 2+ positions, were used as parameters. From comparison with the experimental data exchange interaction anisotropy and g-factors g ⊥ , g ∥ were obtained. At low temperatures T < 4 0 K the coincidence of calculated and experimental results are good and g-factor values are almost the same as have been obtained from EPR data in Co 2 + ( 1 % ) + CdCO 3 single crystals. At high temperatures in the paramagnetic region, experimental data differs from calculated ones by more than two times. It is shown that this discrepancy cannot be described within the frames of used approximations.